Sawmill hog



July 2-8,A 1931. T. B. sUMNER SAWMILL HOG 3 Sheets-Sheet 2 Filed Jan. 27, 1930 Patented July 28, 193

PATENT OFFICE THOMAS B. suivmnn, or EVERETT, WASHINGTON SAWMILL HOG y invention relates to saw mill hogs and the like.4 f

,Y Inthe operation of the grinding machines commonlyknown as sawmill hogs, used in 5 the grinding of waste lumber and refuse into hogfuel, small stones or pieces of gravel and tramp pieces of metal are frequently caught between the rotary grinding head and the anvil knives causing the knives to break and even the sudden stoppage ofthe rotary head, resulting iiik a heavy strain which tends to disrupt the entire machine. i This of course is costly in time and material, and in the manufacture ofv hog fuel, 'which being a waste product, must be converted as cheaplyand economically as possible, is particularly objectionable. Y

Therefore, the object of my invention is to provide a sawmill hogprovided with means 'adapted to kquickly and automatically throw `the knife elements of thehog out of action 'when 4an obstruction is caught between the knives," thereby to' prevent the breaking of the'knives or the said sudden .stoppage of l l25 the machine, and also adapted to permit the hog ytotpbe quickly and easily put into opera- Vtionagain. f y f i v A further obj ect of my invention is to provide such means adapted to'permit the adjustinent of thesaid knife elements relatively to veach other, whereby they will be conveniently aligned for the grinding of hog A"fuel and the like. l y

",The further robject of my invention is to provide means comprising astop and resilient elem-entY for limiting the reaction of said 'knife elements and absorbing the shock resulting from the sudden throwing of the hog out of action. f i "I" attain these objects in a'saw mill hog comprising a housing having a rotary cutter head journaled therein in combination with a movable, angular section carrying an anvil Y 'knife hingedly mounted in said housing on 'eccentric Ashaft sections, means for adjusting said shaft sections relatively to their eccentricity whereby the anvil knifewill be valigned with said rotary cutter head, frangi- 4ble means for holding said anvil knife in op- 'er'ativerelation with said cutter head and .has been thrown out of action;y

Application sied January 27, 1930. serial No. 423,736.

adapted to release said anvil knife under `undue strain imposed on said knife elements,

`the housing provided with a portiony constitutinga stop for said hinged housing sections when released, a bumper element piovided on said stop.

These and other incidental features of my invention, the details of constructiomand mode of operation are hereinafter fully 'described with reference to the accompanying drawings.

In the drawings:

Fig. l shows a longitudinal, vertical section taken on a central line of my hog and illustrates the relative arrangement of the "knife elements;

Fig. 2 shows a side elevation of the movable section carrying the anvil knife, removed from the machine;

Fig. 3 shows a section taken on the line 70 3 3 vof Fig. l;

Fig. 4 shows a side elevation of my hog and illustrates by broken lines the position taken by the movable section when my hog Fig. 5 shows an end elevation of my hog, y taken looking in the .direction of the arrow Y5 in Fig. l;

F igs.y6 and 7 show the details of the frangible elements when in service andv after beso ing broken by an undue strain; n

Fig. 8 shows a section, taken on the line 8 8 of Fig. 5 with parts broken awayy to show further details ofconstruction; i

Fig. 9 shows a side elevation of one of the 85 eccentric shaft sections removed from the ma,-

chine; y Y

Fig. 10 shows further details of the journal mountings for the said eccentric shaft sections; n n n Fig. ll shows a section taken on the line 11-11 of Fig. 10. y y

Referring now to the figures, my saw mill hog comprises a housing a having a rotary cutter head jou'inaled therein comprising in- 95 wardly converging frustro-conical sections b, c, fast on a drivenshaftd journaled in the hog as at f. Transverse knives g are provided in the working 'faces of the saidhead in the usual manner.

The housing a is provided With a movable end section 2, right angular in longitudinal cross section, and hingedly mounted in the housing adjacentrthe corner formed by theV tWo sides thereof on eccentric shaft. section 3, hereinafter more fully described.

A V-shaped anvil knife 4 is secured to the inner face `Voff the said movable section by bolts 5 in the usual manner for cooperation With Y, the said rotary cutter head.

Cooperating flange portions 16 and 7 on the sides of the section y3 and housing a are provided with key hole slots 6a, 7 a, respectively, in Which are provided frangible bolts 8, adapted to hold the said :movable section 2 and the anvil Vknife 4 .in operative position with the rotary .cutting head, under all conditions of normal services, see Figs. 1 and f8, but the said frangible bolts 8 are "adapted to 'break under undue .strain, as when, for instance, a piece v'of lstone w or th'elike, which is too hard for the knife to v vork upon is 'caught between the knives, as illustrated 1n Fig. 1, 'invvfhich case the movable section 2 Will lbe 'caused to assume the position shown in broken lines in Fig. 4, and hence .throw the said knives out of operative position..

To put the hog in Operationagam, it is .only necessary to secure the section 2 in place and insert Vnew frangible bolts in the said slots To, 8a, and the hog lis again 'ready for service. In order to insure that the anvil knife 4 will be properly aligned on vits hinged axis with the said rotary 'cutter head, I have prof, vided the before mentioned eccentric 'shaft sections 3, which consist 'of a'llange head 10, concentric shoulders 11, and an intermediate eccentric bearing portion 1:2. The said shaft sections are j'ourna'le'd in downwardly projecting trunnions 13 on the 'movable section, and are supported in the ibase of the Vhousing onth-e 'concentric shoulders l1 in the Walls 14 vrof -acavity l5, provided therefor. The outer walls of the cavity are provided on their IeX- 'teri'or surfaces with a number of concentrically arranged thread holes lo, yand -the lian ed heads `110oftheshaftsections areyprovide with bolts' '10a Aadapted to Lbe threaded f into'the said holes "156.

By these means, the anvil knife 4 may lbe aligned 'and adjusted relatively to 'the rotar Vcutter head by 'rotating 'each ofthe shaft 'seictions, and thensecuring them in position with the bolts lila, which, due to the eccentric vbearing portions '12, 'shifts the axis oi rotation nof the said section, and hence moves the Aanvil knife relatively to the kcutter head.

In order to provide a stop element for th'e "section @,vvhen it is 'thrown out of action, 'the Walls of the 'adjacent base portion a of the housing are formed so as to slop-e ldownward'- ly avvay from fth'efcavty 15, thus leaving the .lower ,portion of the section 2 unsupported '.when'in operative positions, and resilient bumpersV 128 are provided thereon, against leidde? which the side anges 2b on the said lower portion of the movable section 2, are adapted to strike, When the said frangible bolts are broken by undue strain, and the said movable section is caused to assume the position shown by broken lines in Fig. l. e

I claim: n

l.. In a sav7 mill hog, the combination of a housing having a rotary cutter head journal'e'd therein, a movable section carrying an anvil knifehingedly mounted in said housing on eccentric journal bearings, means for rotating said journal bearings whereby the anvil knife will beshifted relatively to said rotary cutter hea-d aligned with the latter, means for holding said anvil knife in opera-tive relation With said cutter 'head and adapted to release said anvil k,knife under undue strain imposed on said knife elements.

2. In a saw mill hog, the combi-nation of -ahousing .having a rotary `cutter head journaled therein, a movable section carrying an anvil knife hingedly vmounted said housing on eccentric sha-ft sections, means .for rotating said shaft sections whereby the anvil 'knife `will be shifted rela-tively to said-rotary cutter head and aligned With the latter, means for holding said anvil knife in. operative Vrelation with said cutter head 'and adapted to release said anvil knife under .undue strain imposed on said knife elements.

3. In `a saw mill hog, the combination of a housing having a rotary cutter head journaled therein, va movable, angular section carrying an anvil knife hingedly mounted vin y,said housing `on eccentric' shaft sections, means for rotating said shaft sect-ions Whereby the anvilv knife Will be` shifted :relatively to said rotary cutter head and aligned with "the latter, frangi'ble means for holding said anvil knife in operative relation with Vsaid cutter head and adapted to releasesaidanvlil knife under undue strain imposed lon said Iknifeelements'.I

4. In a savv mill hog, the combination .of a housing having a rotary cutterhea'd journaled therein, 1.a movable, angular Asection vcarrying an anvil knife hingedly mounted said housing on eccentric shaft sections, ymeans for rotating .said shaft` sections `Where- LY by the. anvil knife Will be shiftedrelatively lto said rotary cutter headand Valigned with the latter, vfrangible Vmeans for l holding .sai-d anvil knife in operative relation with said cutter head and adaptedto release `saidanvil knife under undue strain .imfposed .on-.said knife elements, the housing provided with .a :portion constituting a stop for said hinged housing sections when released, a bumper element provided on saidstop. I

5. In a savv mill hog, Ythe `combina-tion of a-hous'ing'havinga rotary cutter head journaled therein, a movable vsection carrying :an anvil knife hingedly mounted in said housing on eccentric journal bearings, means :for

ioo

Valg-10 remore4 rotating s aid journal bearings'whereby thel yanvil knife will be shifted relatively to said rotary cutter head and aligned with the latter, means kfor holding said anvil knife in 0perative relation With said cutter head and adapted to release said anvil knife under undue strain imposed on said knife elements, the housing provided Withk a portion constituting a stop for said hinged housing sections When released.

6. In ya saw mill hog, the combination of a housing, a rotary cutter-head journaled therein, a hinged housing section carrying an anvil knife, the axis of the hinge being located at rthe interior rlower corner of said hinged section, and said hinge including adn justable lmeansfor adjusting the anvil knife relatively to the cutter-head, the opposed faces of said section and the housing When iny abutment adapted to position the anvil knife inoperative relation With the cutter-y head, means for holding said movable section in operative position under normal strain but adapted to break under abnormal strain, the housing provided with a sup` porting surface adaptedV to support saidr hinged section, When released, With the anvil knife inoperatively spaced from said cutter-head.

THOMAS B. SUMNER. 

